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Forum: µC & Digital Electronics ATMEL 8051 programming in C, example


von Mike M. (8051help)


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I need to write only numbers (every second) in string on display (memory 
mapped on 0x8001 adress) which are divding with 3 .

I must use counter not delay () for interrupt ...

I got with code below only to printing all numbers in one second.
I need 1 number per second, not all.

Anybody help?
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#include <reg51.h> 
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#include <math.h>                  
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typedef unsigned char byte;
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byte a[8]= {7,5,16,3,1,4,11,9}; 
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byte counter;
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byte xdata display _at_ 0x8001;
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byte started = 0;
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int i=0;
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sbit switcher=P0^0;
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void Inic(void) 
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{
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    EA=1;         
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    TMOD=1;       
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    TH0=0x3C;     
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    TL0=0xAF;    
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    TR0=1;
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    counter=1;    
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}
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void timer0(void) interrupt 1 using 2 
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{    
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    TH0=0x3C;  
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    TL0=0xAF;                
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  counter--; 
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    if(counter == 0)         
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          {
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            counter = 20;        
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       if(started == 1)  
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         {
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         if(i < 8)              
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            if(!(a[i]%3) )       
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               display=a[i];                            
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         i++;             
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         if(i == 8)                            
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            {
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            ET0 = 0;      
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            TR0 = 0;     
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            started = 0;  
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            }
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         }
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    }   
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}
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void main(void) 
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{
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   Inic();        
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   switcher = 1;  
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   while(1)       
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     {                    
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     if(switcher == 0)    
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       if(started == 0)   
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          {         
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          started = 1;    
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          i = 0;          
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          counter = 20;    
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          TH0=0x3C;       
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          TL0=0xAF;      
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          ET0=1;        
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          TR0=1;            
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          }
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     }            
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}

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